Category:John Tregoning
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John Tregoning (c. 1845 - c. 1920) was an American mechanical engineer and inventor from Lynn, Massachusetts,
American mechanical engineer, inventor and business manager | |||||
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| Date of birth | 1840s | ||||
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Media in category "John Tregoning"
The following 6 files are in this category, out of 6 total.
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A Treatise on Factory Management, 1891.jpg 512 × 797; 63 KB
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Abstract of Pay Roll, 1891.jpg 862 × 667; 85 KB
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Improved Steam Valve for pumping engines, 1879.jpg 911 × 1,459; 141 KB
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Shop Order Board, 1891.jpg 766 × 472; 54 KB
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Shop Order Card, 1891.jpg 719 × 599; 60 KB
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Technical drawing, 1891.jpg 1,237 × 794; 114 KB
